Enhancement - Permission

- Implemented new Permission object to manage tri-state confirmation
  of changes to multiple tasks.

src/Permission.cpp

@@ -0,0 +1,58 @@
+////////////////////////////////////////////////////////////////////////////////
+// task - a command line task list manager.
+//
+// Copyright 2006 - 2009, Paul Beckingham.
+// All rights reserved.
+//
+// This program is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation; either version 2 of the License, or (at your option) any later
+// version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the
+//
+//     Free Software Foundation, Inc.,
+//     51 Franklin Street, Fifth Floor,
+//     Boston, MA
+//     02110-1301
+//     USA
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include "Permission.h"
+#include "util.h"
+#include "i18n.h"
+
+////////////////////////////////////////////////////////////////////////////////
+Permission::Permission ()
+: needConfirmation (false)
+, allConfirmed (false)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+bool Permission::confirmed (const std::string& question)
+{
+  if (!needConfirmation)
+    return true;
+
+  if (allConfirmed)
+    return true;
+
+  int answer = confirm3 (question);
+  if (answer == 2)
+    allConfirmed = true;
+
+  if (answer > 0)
+    return true;
+
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////